Please break you Mails at 72 characters since my terminal is only 132 chars (others may only 80 characters) because I do not want to break code sniples into several lines...
Your longest line is 254 characters!!!
Am 2007-04-05 22:30:55, schrieb memutza:
> Hi,
>
> I have an application that needs to run its own version of some system-calls
> (fork, wait, kill, etc.): the source-code therefore includes a small
> assembly-code module to do that, calling the kernel directly using "int 0x80"
> and bypassing the libraries.
No it is not posibel, except you want to crash your system.
> The application is not threaded, but since a new glibc library was installed,
> it occasionally gets stuck. Using STRACE, I found that it is stuck on the
> "futex()" system-call, which I understand is used for threading.
Which NEW glibc? 2.5?
> I have no idea why "futex()" was called in the first place because the
> application uses no threads, but it seems that futex is waiting for some
> value in memory to change, which was probably supposed to be set by one of
> the bypassed system-calls.
>
> 1. Is there a way to tell GLIBC that my application is not threaded, so it
> does not attempt to use threading system-calls (perhaps a compilation flag,
> or an environment variable)?
It does this automaticaly, and you get your error,
BECAUSE you want to bypass glibc
> 2. Is there anything wrong for a program to issue system-calls directly?
>
> 3. Is there a correct way to bypass such unwanted threading system-calls (for
> example by providing dummy routines that return 0 or -1/ENOSYS)?
Not that I know...
Note: Currently I am reading "Programming with POSIX threads"
and you should do this too... :-)
Thanks, Greetings and nice Day
Michelle Konzack
Systemadministrator
Tamay Dogan Network
Debian GNU/Linux Consultant
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